1·有记载的最早的重量驱动机械钟是1283年在英国贝德福德郡建造的。
The earliest recorded weight-driven mechanical clock was built in 1283 in Bedfordshire in England.
2·启动gdb并指定进程标识，在我举的这个例子中是' gdb eg2 1283 '。
Start GDB and specify your pid, in my case with 'GDB eg2 1283'.
3·还可以首先使用 'file eg2' 装入文件，然后发出 'attach 1283' 命令连接到进程标识 1283 下的 eg2。
We could also attach to eg2 under pid 1283 by first loading the file in with 'file eg2' then issuing the attach command 'attach 1283'.